构造断裂过程中的剪切定位和应变分布——来自颗粒流实验和高分辨率光学图像相关技术的新见解

2019/12/03   下载量： 0 次

方案摘要

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应用领域 地矿
检测样本 其他
检测项目
参考标准 暂无

采用LaVison公司的2D2C和3D3C StrainMaster数字图像相关测量分析系统。对沙箱模型内的颗粒流运动进行了成像测量。获得了构造断裂过程中的剪切定位和应变分布信息。

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方案详情

Brittle faults reflect a complex strain history that emerges from contrasting modes of distributed and localised deformation, and their interaction on various spatial and temporal scales. To better understand this process, we monitor the displacement field in scaled tectonic model experiments using high-resolution optical image correlation techniques (particle imaging velocimetry, PIV).

2D and 3D surface displacement data of extensional and contractional sandbox experiments show that the mode, pattern, and temporal variation of strain accumulation are strongly dependent on the non-linear strain-dependent frictional strength of granular model materials
similar to natural deformation processes in brittle rocks. Strain hardening and softening control the shear zone formation.

The pattern of localised deformation is established much earlier than is visible from visual inspection of the experiment. Evolution of distributed strain in the surrounding material of the shear zones and discontinuous shear re-localisation control later stages irrespective of the
kinematic boundary conditions.

High-resolution optical strain monitoring quantifies the spatial and temporal patterns of strain accumulation in our model experiments with unprecedented detail. Together with detailed characterisation of the deformation behaviour of the model materials, our experiments will help to re-evaluate important scaling issues, and allow accurate comparison of analogue experiments with numerical simulations.

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下一篇 脉冲流场在USP溶解仪中引起的水动力复杂性

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北京欧兰科技发展有限公司
金牌会员 丨 第17年
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